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CMAKE_TOOLCHAIN_FILE
--------------------
.. versionadded:: 3.21
.. include:: ENV_VAR.txt
The ``CMAKE_TOOLCHAIN_FILE`` environment variable specifies a default value
for the :variable:`CMAKE_TOOLCHAIN_FILE` variable when there is no explicit
configuration given on the first run while creating a new build tree.
On later runs in an existing build tree the value persists in the cache
as :variable:`CMAKE_TOOLCHAIN_FILE`.
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